The missing 3rd axis here is the YAW (panning) which mainly plays a role when walking or running. But if you're in a fairly static stance and just sweeping your arms up, down, left, and right the 2 Motors included in this stabilizer (Pitch and Roll) are all you'll really need. So while many gimbals out there for smartphones are going hundreds of dollars, this new iPhone 2-Axis Gimbal is up for under $50 bucks (found here)